We're currently testing nukeWYSIWYG(tm) 2.6, featuring FCKeditor 2.6.  Features include:

• (new) Floating dialogs to avoid problems with popup blockers & enhance usability
• (new) Toolbar includes a button for Blockquote
• (new) Table's columns size can now be changed by dragging on cell borders
• (new) "Show Blocks" command button in toolbar to show block details in the editing area.
• (improved) Official compatibility support with Opera 9.50 and Safari 3
• (improved) XHTML compliance
• (improved) allow image for non-admins, uploads are secured to admins only
• (improved) "Merge Down/Right" for merging tables cells in non-Gecko browsers.
• (improved) Find and Replace dialogs are now unified into a single dialog with tabs.

See it here on the Submit News page.